Jarir reported that the Prophet, may Allah bless him and grant him peace, said:

“Allah will not show mercy to a person who does not show mercy to other people.”

[Adab al-Mufred, 375]

The Prophet, peace be upon him, said: “He who does not show mercy to our young or show esteem for our elders is not one of us.”

[Bukhari, 360]

The Prophet, peace be upon him, said: “He who is not merciful to others, will not be treated mercifully.”

[Bukhari, 8/42]

Abu Huraira reported that the Messenger of Allah, may Allah bless him and grant him peace, said: “One day a man became very thirsty while walking down the road. He came across a well, went down into it, and drank and then climbed out. In front of him he found a dog panting, eating the dust out of thirst. The man said: “This dog is as thirsty as I was.” He went down back into the well and filled his show, putting it into his mouth (in order to climb back up) and then gave the dog water. Therefore Allah thanked him and forgave him.”

They said: “Messenger of Allah, will we have a reward on account of animals?”

He said: “There is a reward on account of every living thing.”

[Adab al-Mufred, 378]

Abu Umama reported that the Prophet, may Allah bless him and grant him peace, said: “Anyone who shows mercy, even to an animal meant for slaughtering, will be shown mercy by Allah on the Day of Rising.”